Renewable teeth or segments for crusher rolls



Patented July 5, 1932 UNITED STATES ,PA'rrzlSJ-lfl OFFICE A EDWIN II. KEIPER, on PHILADELPHIA, PENNSYLVANIA, AssIGNoR ro rnNNsYLvANIA caesaer COMPANY, OFNEW YORK, N. Y., A CORPORATION OF. NEW YORK RENEWABLE 'rnETII on snGMnNTs Fon oRUsIInR ROLLS Application mea Mayl a1, 1930, serial No. *4548,335.'V

\ 5 n-ewable teeth for such rolls; vsuch teeth occupying preformed recesses in the wall. of the Crusher roll.

A further object'ofmy invention is to provide efficient means for holding such teeth in 1o place that will permit removal and replacement of the same'. Y Y

These and other features of my invention aremore fully set'forth hereinafter; reference being had to the accompanying ydraw.

ing in which:

Figure 1 is a fragmentary sectional'view illustrating one form of renewable tooth and its holding means in position inthe roll, within the scope of my invention.

Fig. 2 is a plan view of the tooth shown in Fig. 1.

Fig. 3 is a view similar to Fig. 1 illustrating a modification within the scope of my invention.

Fig. 4 is a sectional view on the line IIT-JV, Fig. 1, on a smaller scale, looking in the direction of the arrow a, and

Fig. 5 is a perspective view on a reduced scale of the wedgeemployed with the tooth shown in Fig. 1.

In the drawing, 1 represents a portion of a Crusher roll or similarbody, having a recess 2, with an undercut wall 2a. Within the recess 2 is an inserted tooth 3, khaving a toe 3a, which substantially fitsthe undercut wall 2a. At the opposite end of this tooth whose surface may be radially disposed with respect to the axis of the roll, securing means therefor are provided in the form of a wedge 4i, and a key 5 the latter lying between the wedge and the tooth and having a portion 5a underlying the heel of the tooth which is recessed at 3 for the purpose of receiving the same.

After the tooth has been inserted, together with the key, and the toe of the tooth has been jammed against the undercut wall 2 of the recess, the wedge 4 is driven home between said key and the wall 2b of the recess 2, and then the upper portion of the key, indicated by do-tted lines Fig. 1, is bent over on top ofthe wedge, as clearly indicated by full lines in said figure. The key-is. of such metal and construction as to retain it'sbent over vcondition during use.

The wedge may be of the shape illustrated l' in Fig. 5, having a recessed vtop portion` as indicated at ltwith end projections 4b; the

bent'over portion ofthe `key lying in the recess between said projections 4b; Preferably the wedge is driven into its seat until its outer end is nearly flush `with the surface of the crusherroll or other body and4 as the turned over portion of, the key fits into the recessed end of said wedge it willalso 'lie in the same plane as the rtop of th-e wedge.

When a tooth becomes worn to such an extent as 'to make replacement desirable, the wedge 1s to be removed. To facilitate revmoval I may provide the wedge with a through opening 6, threadednear its lower end at 7 for the reception of'a screw member forming part of suitable removing means.

`As this through Opening is liable to become clogged with-stone or coal dust, rust and the like, when the roll is in use, the removal of .which would be difficult if notimpossible, yI

may close this hole with an easily destroyed plug'of wood or suitable non-metallic mate? rial, as indicated at 8.

The tooth 3 may be cored out as indicated .at 8c to lighten the discard; As these teeth Vmay rust. fast to theroll in use, the coring permits the application of. a torch to burn thefsame away when unduly worn.

The form of tooth illustrated in Fig. 3 is slightly larger than that illustratedin Figs.

1 and .2, but otherwise of. the `same construction.. I have illustrated with this tooth ya slightlydifi'erent fornrof wedge inl that it is provided with a transverse opening (Safor .the reception'of a prying tool, when it is desired to lremove the same. This hole may be at an angle as indicated and the roll may be recessed or grooved opposite the same, as indicated at 1, for the ready insertion of a prying tool. T his hole may be filled with removable 'niaterial after it has been driven home'. This tooth is also shownA asi coredand to assist the actionyof vthelcutting flame it -may be provided with'a small bore 3d opening from the rear of its outer face. The toothI shown in Figs. 1 and 2 may be provided with a similar bore.

It will be further understood that my improved locking means for teeth and/or similar abutments or impact members employed with crusher rolls may be applied to other elements of crushing machinery wherein a renewable part or member performing similar or substantially similar work may be held in place by similar locking means.

It will be understood, of course, that the crusher roll may be provided with a complete set of inserted teeth extending circumferentially as well as longitudinally of the same and that such teeth may be in alignment or staggered as may be desired. I

While I have illustrated single teeth set in recesses formed in the wall of a crusher roll or similar body, these teeth may be of any width desired and I may employ similar securing means for holding segments in place and/or blades extending the full length of a roll or other form of rotating carrier.

I claim: 1. In crushing machinery, the combination of a supporting member having a recess with an undercut wall, an insertable impact member ydisposed in said recess and having a portion underlying said undercut wall, a wedge applied to said 'recess at the heel of the insertable member for holding the latter in said recess, and a key disposed between thev insertable member-and wedge and having its lower end retained by the insertable member and its opposite end bent over the top of the wedge to hold the latter in place; said insertable impact member being recessed for the reception of the inner end of the key. H 2. In crushing machinery, the combination of a supporting member having a recess with an undercut wall, an insertable impact member having a portion underlying said undercut wall and having a portion of its rear wall undercut, a Wedge applied to said recess at the heel of said insertable impact member for holding the latter in said recess, and a key retained by the insertable impact member and having one end bent over the top ofthe Wedge to hold the latte-r in place; said key being disposed between the insertable impact member and the wedge and having a portion lying Within the undercut portion of said vinsertable impact member.

3. A crusher roll having a recess with an vundercut wall, a tooth having a projecting toe portion fitting beneath said undercut wall, a we dge applied to said recess at the heel of the tooth for holding the latter in place; the rearwall of said tooth being undercut at its base portion, and a key having one end retained in the undercut portion of said tooth and having its opposite end bent over the top of the wedge to hold the latter in place; said key being disposed between the tooth and wedge.

4. A crusher roll having a recess with an undercut wall, a hollow tooth having a projecting toe fitting said undercut wall, a wedge applied to said recess at the heel of the tooth for holding the latter in said recess, a key disposed between the tooth and wedge and having its lower end retained in an undercut portion of the tooth and its opposite end bent over the top of the wedge to hold the latter in place, and means carried by said wedge for laterally retaining the bent over edge of said key.

5. In a structure such as set forth in claim 3, providing the upper end of the wedge with a recess flanked by projections for the reception of thev bent over portion of the key.

6. In a structure of the character set forth in claim 3, providing the wedge with an openingl for the insertion of a removing tool, and a plug of readily destructive nonmetallic material substantially filling said opening.

7. Ina structure of the character set forth in claim 3, providing the wedge with an opening for the insertion of removing means; said opening having a threaded portion for engagement with a threaded portion of such removing means.

In witness whereof I have signed this specification. Y

EDWIN H. KEIPEB. 

